BHO can refer to:
- Barack Hussein Obama II, 44th president of the United States (2009–2017)
- Barack Hussein Obama, Sr., father of Barack Hussein Obama II
- Bhojpuri language
- Bibliotheca Hagiographica Orientalis, a hagiographical sourcebook
- Blackhorse Road station
- British History Online
- Browser Helper Object
- Butane hash oil
- Raja Bhoj Airport IATA code
